JPS583875Y2 - Anchor for supporting concrete formwork - Google Patents

Description

[Detailed description of the invention] For example, when constructing a concrete retaining wall of a desired height, the concrete is poured in stages from the bottom to the top. When placing the next concrete in the upper part, a part of the concrete placed earlier is to bear part of the placing load that acts on the concrete formwork. This invention relates to an anchor that is fixed in place and used to tension and support a conch notebook formwork.

In general, in concrete structures constructed using the construction method described above, anchors are inserted after the concrete in the poured concrete part has hardened to a semi-solidified state that can reliably hold the embedded anchors in place. Next, means is taken to erect a formwork supporting member such as a rod over the cast formwork and the exposed end of the anchor from the surface of the cast concrete part.

In recent years, the drawback of the conventional anchor, the headed bolt, is that due to the large area of the tip of the head, there is a large resistance to embedding it in the poured concrete.
The embedding process becomes difficult and inefficient, and
When embedding into the poured concrete part, the head comes first, so
Although a large hole is formed in the poured concrete part with a diameter equivalent to the diameter of the head and cannot be backfilled only by shrinkage or flow of the concrete, and a head is used for pull-out resistance, In order to eliminate the drawback of not being able to express sufficient pull-out resistance in the hardened state of concrete, the main body of the anchor is constructed from a strip-shaped member, and the upper end of the main body of the strip-shaped anchor is An anchor has been developed in which a plurality of tongues are formed by punching and bending so as to separate from the plate surface.

That is, according to this, because the main body of the anchor is thin, the area of its embedding tip surface is narrow, and the tongue piece protrudes backward and outward in the embedding direction, the embedding resistance in the poured concrete part is low. It is small and can be easily and quickly inserted into a semi-solidified concrete part, and is large enough to backfill the hole formed in the poured concrete part by shrinkage and flow of the concrete. It can be made narrow, and when a pull-out force is applied to the main body of the anchor, the tongue piece bites into the poured concrete part and locks, which is large compared to its protruding length. Since it exhibits pull-out resistance, the cast concrete has the effect of being able to exhibit sufficient pull-out resistance when it hardens.

However, in this developed anchor, tongue pieces were made to protrude from the plate surface of the main band-like anchor from the factory production stage, which made it difficult to handle a large number of anchors at once during the distribution stage and delivery to the site. It is bulky, and the tongues of the anchors tend to get entangled with each other, making it very cumbersome to take out the anchors one by one from a group of anchors, and there is a high risk of injury to the hands or the like from the tongues.

In addition, when a large number of layers are stacked, the tongue pieces may become recessed, which may increase the embedding resistance and reduce the pull-out resistance, resulting in defective products. .

The anchor for supporting concrete formwork according to the present invention was developed in view of the above-mentioned problems, and is characterized in that a cut for bending the tongue piece is formed in the main body of the belt-like anchor.

That is, during the distribution stage and at the time of delivery to the site, the tongue piece is flush with the main body of the strip-shaped anchor, and the entire anchor is shaped like a strip.

Therefore, when handling a large number of anchors at once,
These can be stacked in parallel or stacked in close contact with each other, which significantly reduces the space required, and since there is no tangling between the tongues, it is extremely easy to take out the anchors one by one from a group of anchors. It can be taken out quickly and easily, and there is no risk of injuring your hands with the tongue piece.

Then, in the field, the tongue piece can be bent with pliers, a hammer, etc. In this case, because of the cut mentioned above, the tongue piece can be bent very easily and precisely in line with the desired posture. It also has the advantage of being able to

Hereinafter, embodiments of the present invention will be described based on the drawings.

A in FIGS. 1 and 2 indicates that the left and right end surfaces 1a,
This is an anchor according to the present invention in which a continuous cut 2.2 is formed diagonally downward inward from la.

Both cuts 2, 2 are located at a position f[ge] above and below. A locking part 4 for locking the lower end of a formwork support member 7, which will be described later, is formed in the upper end of this anchor A as a round hole, while the lower end is formed in a sharp shape. There is.

FIG. 3 shows a modification of the anchor A according to the present invention, in which interrupted cuts 2, 2 in the form of perforations are provided instead of continuous cuts.

Fig. 4 shows a case in which the cuts 2, 2 are provided at the same height above and below, and Fig. 5 shows a case in which a plurality of opposing cuts 2, 2 are provided in upper and lower stages.

The cuts 2, . . . may be discontinuous in the ones shown in FIGS. 4 and 5, and the opposing cuts 2, 2 may be provided at the same height in the ones shown in FIG.

In any case, the outer part 3 of the cut 2...
... is flush with subject 1.

Hereinafter, the usage pattern of the anchor A according to the present invention will be explained.

As shown in Fig. 6, a large number of anchors A are stacked and transported to the site.

At the site, facing concrete formwork 5, 5...
・Place concrete (C) in between as shown in Figure 7.

Next, as shown in FIG. 8, the outer portions 3, 3 of the cuts 2, 2 of the anchor A are bent from the main body 1 using pliers or a hammer to form a tongue piece 3'.

3' is constructed.

The anchors A, A thus constructed are then embedded and fixed in semi-solidified concrete (C) with their locking portions 4 protruding as shown in FIG.

Then, the upper formwork 5, 5... is replaced with the lower formwork 5゜5.
Assemble to...

At this time, joint members 6, 6 are inserted and locked between upper and lower adjacent formworks 5.5.

Then, depending on the solidification state of the poured concrete C, formwork supporting members 7, 7 such as rods are erected between the anchors A, A and the joint members 6, 6, and the upper formwork 5, 5...
...to be supported.

Then, the next concrete is poured between the upper opposing formwork 5°5...

In FIG. 10, a special driving step 1b is formed to prevent the locking part 4 from being damaged when driving the anchor A.

Incidentally, anchors A, joint members 6, and supporting members 7 may be used as shown in imaginary lines to support the lower formworks 5, 5, . . . in FIG. 7.

For reference, the recently developed conventional anchor mentioned above was manufactured and transported in the state shown in Figure 8.

[Brief explanation of drawings]

The drawings illustrate embodiments of the anchor for supporting concrete formwork according to the present invention; FIG. 1 is a front view, FIG. 2 is a side view, and FIGS. 3 to 5 are front views of different embodiments. , FIG. 6 is a side view showing a laminated state, FIGS. 7 to 9 are side views showing a state of use, and FIG. 10 is a front view of yet another embodiment. DESCRIPTION OF SYMBOLS 1... Band-shaped anchor main body, 2... Cut, 3'... Bent tongue piece, 4... Locking part, 5... ...Concrete formwork, 7...
Formwork support member, C...Poured concrete.

Claims (1)

[Scope of utility model registration request] It has a bent tongue piece 3' that exerts pull-out resistance when inserted into the poured concrete (C), and has a bent tongue piece 3' for supporting the concrete formwork 5 at the end exposed on the surface of the poured concrete C. An anchor for supporting concrete formwork, which has an end locking part 4 of a member 7, and is characterized in that a strip-shaped anchor main body 1 has a cut 2 for bending the tongue piece 3'. .